麻豆传媒

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iss067e189024 (July 16, 2022) --- The sun's rays begin to illuminate the Earth's atmosphere as the International Space Station flew into an orbital sunrise 261 miles above Texas. iss067e189024 NASA ID: iss067e189024 iss067e189024 (July 16, 2022) --- The sun's rays begin to illuminate the Earth's atmosphere as the International Space Station flew into an orbital sunrise 261 miles above Texas. Date Created:2022-07-16 Center:JSC

When was the first sunrise on Earth?

This is a question of how we define 鈥淓arth鈥�, say our readers, but we also need to consider when light from the young sun could have pierced Earth鈥檚 atmosphere

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Bengal cat washing itself on bed; Shutterstock ID 1123136123; purchase_order: -; job: -; client: -; other: -

Why do cats wash themselves, while dogs don鈥檛?

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MNN37P Illustration comparing the planets of the Solar System and the Sun on the same scale. The planets are shown to scale relative to each other but their distances are not. From left to right the bodies are: the Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

Will the planets of our solar system ever line up in a row? (Part 2)

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Big dog meets small dog; Shutterstock ID 2045462630; purchase_order: -; job: -; client: -; other: -

This week鈥檚 new questions

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Have bite-mark forensics bitten the dust?

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Tom Gauld on contact with aliens

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Twisteddoodles on how a science project might gain media attention

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Engineer Jason Lyon poses as he views Loo Garden, a temporary subterranean garden designed to represent a future healthier River Thames, in a section of the Thames Tideway Tunnel - commonly known as the 'Super Sewer' - a 25 kilometre tunnel being built across London under and along the River Thames to deal with combined sewer overflows currently polluting the river, in London, Britain, June 29, 2023. REUTERS/Toby Melville - RC22T1ANLLXT

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See the garden blooming in a ‘super sewer’ deep below London

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Mathematics

The stunningly simple rule that will always get you out of a maze

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HCNBCF THOR: THE DARK WORLD, Chris Hemsworth as Thor, 2013. ph: Jay Maidment/?Walt Disney Studios/courtesy Everett Collection

Could you make a machine that 鈥渇lew鈥� like Thor鈥檚 hammer in the comics?

Such machines already exist, in a sense, say our readers - but an immortal being might also be using effects science has yet to understand

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If humans colonised Mars, how would they calculate time? (Part 2)

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This week鈥檚 new questions

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Could a cat nose function as a ‘highly efficient’ gas chromatograph?

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Tom Gauld on a physicist’s summer holiday

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